Chemical composition and insecticidal activity of the essential oil from Helichrysum faradifani endemic to Madagascar

Abstract

Helichrysum faradifani (Asteraceae) is a perennial shrub growing in rocky and sandy places of Madagascar. The plant is used in the Malagasy traditional medicine as a wound-healing agent, disinfectant and for the treatment of syphilis, diarrhea, cough and headache. In the present work, we analysed the chemical composition of the essential oil distilled from the aerial parts of H. faradifani by GC-MS and evaluated its insecticidal activity against 2nd, 3rd and 4th instar larvae of the lymphatic filariasis vector Culex quinquefasciatus by acute toxicity assays. The most sensitive were 2nd instar (LC = 85.7 μL L) larvae. For the 3rd and 4th instar larvae, the estimated LC were 156.8 and 134.1 μL L, respectively. Monoterpene hydrocarbons (51.6%) were the major fraction of the essential oil, with the bicyclic α-fenchene (35.6%) as the predominant component. Sesquiterpene hydrocarbons (34.0%) were the second major group characterising the oil, with γ-curcumene (17.7%) as the most abundant component.

Evaluation of Drimys winteri (Canelo) Essential Oil as Insecticide against Acanthoscelides obtectus (Coleoptera: Bruchidae) and Aegorhinus superciliosus (Coleoptera: Curculionidae)

“…Ell. (Asteraceae) EO was toxic at 85.7 μL L −1 on the larvae of Culex quinquefasciatus (Say) (Diptera: Culicidae) [ 73 ]. Both EOs contained eudesmol and their isomers in their composition.…”

Chemical Composition of Aerial Parts Essential Oils from Six Endemic Malagasy Helichrysum Species

“…Essential oils and extracts are obtained from the whole plant or from different parts of the plant and they are used in perfumery and aromatherapy. Biological activity or insecticidal activity have been reported [3]. In the literature, the chemical composition of essential oil (EO) from seven species has been studied [3][4][5][6][7][8][9][10][11].…”

“…H. faradifani and H. gymnocephalum are the most studied species and four papers reported their chemical compositions. Three different compositions are described for H. faradifani essential oil: (i) (E)-β-caryophyllene (34.6%) [6], (ii) β-himachalene (15-32.8%) associated with α-fenchene (13.1-27.3%) [5], and (iii) α-fenchene (32.3% and 35.5%) [3,10]. The chemical composition of H. gymnocephalum oil is homogeneous and characterized by the occurrence of 1,8-cineole (66.7% [7], 59.7% [6], 47.4% [4], and 17.4% [9]).…”

Volatile chemical composition of essential oil from <i>Bursera graveolens</i> (Kunth) Triana & Planch and their fumigant and repellent activities

“…Essential oils (EO's) are a mixture of chemical compounds of an organic nature, which are found as end products of the secondary metabolism of aromatic plants, which are responsible for their characteristic aromas and bioactivities (Andres et al, 2017). Biological pesticides consisting mainly of essential oils have been shown to exert fungicidal, insecticidal and bactericidal effects, among others; therefore, their use in agroindustry has increased exponentially, what has been known as green alternatives in recent years (Prieto, Patiño, Delgado, Moreno, & Cuca, 2011;Benelli et al, 2017). Essential oils have been specially investigated as natural insecticides against several insects from stored products, and many studies have used the red flour beetle Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) as a biological model.…”